You can change the start date of a work item from the header of your work item. Click Due to reveal the option to update the start date and due date of that work item.

Alternatively, you can also edit the start date of a work item from the Key Dates section of the Details tab.

If the work item has any tasks with due dates set, changing the start date will present a modal giving you the opportunity to leave task due dates as they are, or update them the same number of days forward or backward that you are changing the start date.

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